1. Petrochemical and Allied Department, National Research Institute for Chemical Technology, Zaria, Nigeria
2. Industrial and Environmental Pollution Department, National Research Institute for Chemical Technology, Zaria, Nigeria
3. Scientific and Industrial Research Department, National Research Institute for Chemical Technology, Zaria, Nigeria
4. Department of Physics, College of Science, Sultan Qaboos University, Muscat, Oman
5. Office of the Director General, National Research Institute for Chemical Technology, Zaria, Nigeria
6. Department of Chemistry, Modibbo Adama University of Technology, Yola, Nigeria